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There were several functions I believe no one is currently using that were
only implemented in the GL backend (cogl_offscreen_blit_region and
cogl_offscreen_blit) that have simply been removed so we have a chance to
think about design later with a real use case.
There was one nonsense function (cogl_offscreen_new_multisample) that
sounded exciting but in all cases it just returned COGL_INVALID_HANDLE
(though at least for GL it checked for multisampling support first!?)
it has also been removed.
The MASK draw buffer type has been removed. If we want to expose color
masking later then I think it at least would be nicer to have the mask be a
property that can be set on any draw buffer.
The cogl_draw_buffer and cogl_{push,pop}_draw_buffer function prototypes
have been moved up into cogl.h since they are for managing global Cogl state
and not for modifying or creating the actual offscreen buffers.
This also documents the API so for example desiphering the semantics of
cogl_offscreen_new_to_texture() should be a bit easier now.
97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_OFFSCREEN_H__
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#define __COGL_OFFSCREEN_H__
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#include <cogl/cogl-types.h>
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-offscreen
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* @short_description: Fuctions for creating and manipulating offscreen
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* frame buffer objects
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*
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* Cogl allows creating and operating on offscreen render targets.
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*/
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/* Offscreen api */
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/**
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* cogl_offscreen_new_to_texture:
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* @handle: A CoglHandle for a Cogl texture
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*
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* This creates an offscreen buffer object using the given texture as the
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* primary color buffer. It doesn't just initialize the contents of the
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* offscreen buffer with the texture; they are tightly bound so that
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* drawing to the offscreen buffer effectivly updates the contents of the
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* given texture. You don't need to destroy the offscreen buffer before
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* you can use the texture again.
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*
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* Note: This does not work with sliced Cogl textures.
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*
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* Returns: a CoglHandle for the new offscreen buffer or COGL_INVALID_HANDLE
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* if it wasn't possible to create the buffer.
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*/
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CoglHandle cogl_offscreen_new_to_texture (CoglHandle texhandle);
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/**
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* cogl_offscreen_ref:
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* @handle: A CoglHandle for an offscreen buffer
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*
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* Increments the reference count on the offscreen buffer.
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*
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* Returns: For convenience it returns the given CoglHandle
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*/
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CoglHandle cogl_offscreen_ref (CoglHandle handle);
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/**
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* cogl_is_offscreen:
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* @handle: A CoglHandle for an offscreen buffer
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*
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* Gets whether the given handle references an existing offscreen buffer
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* object.
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*
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* Returns: %TRUE if the handle references an offscreen buffer,
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* %FALSE otherwise
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*/
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gboolean cogl_is_offscreen (CoglHandle handle);
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/**
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* cogl_offscreen_unref:
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* @handle: A CoglHandle for an offscreen buffer
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*
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* Decreases the reference count for the offscreen buffer and frees it when
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* the count reaches 0.
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*/
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void cogl_offscreen_unref (CoglHandle handle);
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G_END_DECLS
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#endif /* __COGL_OFFSCREEN_H__ */
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